Composition of matter for the electrical insulation of wires covered with cotton



UNITED STATES ATENT tries.

JOHN FOTTRELL, OF PHILADELPHIA, PENNSYLVANIA.

COMPOSITION OF MATTER FOR THE ELECTRICAL INSULATION OF WIRES COVERED WITH OR WORSTED BRAID 0R TAPE.

COTTON, SILK,

SPECIFICATION forming part of Letters Patent No. 344,823, dated July 6, 1886.

Application filed November 10, 1885. Serial No. 182,387.

To aZZ whom, it may concern.-

Be it known that I, JOHN FOTTRELL, a subject of the Queen of Great Britain and Ireland, residing at N o. 621 Silliman street, Philadelphia, in the county of Philadelphia and State of Pen nsyl-vania, have invented a new and useful Composition of Matter to be Used for the Electrical Insulating of Wires Covered with Cotton, Silk, or \Vorstcd Braid or Tape, of which the following is a specification.

My composition consists of the following ingredients, combined in the proportions stated, viz: boiled linseed-oil, six gallons; oxide of zinc, ten pounds; Venice turpentine, one pound; lead out into thin shavings,two pounds. These ingredients are to be thoroughly mixed in a suitable-sized pot, of iron or copper, and boiled for eight hours with occasional stirring. After this mixture has cooled,strain itthrough muslin, and add to it copal varnish, one gallon; sandarac varnish, one pint. This produces a white flexible yet hard composition, which can be colored any color by mixing it with pigments of the desired color. This composition dries rapidly. In using it for insulating electrical wires I No specimo: s.)

adopt the following plan: The covered Wire is thoroughly saturated with benziue first, then immediately coated with the composition before the benzine can evaporate. By doing this the composition penetrates properly through the covering on the wire, and when dry the wire is thoroughly insulated electrically.

I am aware that thereare compositions COlllposed of oils and varnishes used for electrical insulation; but I am not aware that all the ingredients of my composition in the propor tions stated have been used together.

WVhat I claim, and desire to secure by Letters Patent of the United States, is

The herein-described composition of matter to be used for the electrical insulation of wires, consisting oflinseed-oil, lead shavings, oxide of zinc, Venetian turpentine, gum-copal, and gum-sandarac, in the proportions specified.

JOHN FOTTRELL.

Witnesses:

W. J. FLANAGIN, ALFRED J. BRIGGS. 

